Saw-sharpening device.



J. R. SMITH.

SAW SHARPENING DEVICE.

APPLICATION FILED JAN. 11, 1913.

Patented June 15, 1915.

5 SHEETSSHEET 1- THE NORR IS PETERS 60.. PHm'n-I WHOM WASHINGTON D C J.B. SMITH.

SAW SHARPENING DEVICE.

APPLICATION FILED JAN.11, 1913.

Patented June 15, 1915.

5 SHEETS-SHEET 2- THE NORRIS PETERS CO., PHOTO-LITHQi. WASHING 1 J. R.SMITH.

- SAW SHARPENING DEVICE.

APPLCATIQN HLED lAN.11, 1913- 1,14:3,084. Patented June 15, 1915.

5 SHEETS-SHEET 3- THE NORRIS PETERS CQ. PHOTO-LITHQ. WASHINGTON. D.

J. B. SMITH.

SAW SHARPENING DEVICE.

APPLICATION mp0 JAN- 11. 1.913.

Patented June 15, 1915.

g W=b========= w R mm \m 010-LIrHO.. WASHINGTON, D. C

J. R. SMITH.

SAW SHARPENING DEVICE.

APPLICATION FILED JAN-11,1913.

Patented June 15, 1915.

5 SHEETSSHEET 5- THE NORRIS PETERS Ca, PHDTO-LITHCL. WASHINGTON, D. C.

' TQE.

JOHN E. SMITH, OF MCDONOQUGH, GEORGIA, ASSIGNOR. OF FORTY ONE-HUNDREDTHSTO HORATIO H. NEWMAN, F SANDERSVILLE, GEORGIA.

SAW-SHARPENING DEVICE.

To all whom it may concern:

Be it known that I, JoHN B. SMITH, a citizen of the United States,residing at Mo- Donough, in the county of Henry and State of Georgia,have invented certain new and useful Improvements in Saw-SharpeningDevices; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to a saw filing and gumming machine, and has forits object to produce a mechanism especially adapted for operating ongin saws which will be more efiicient in action, simple in construction,and less expensive to construct than those heretofore proposed for thesame purpose.

With these and other objects in view, the invention consists in thenovel details of construction and combinations of parts'more fullyhereinafter disclosed and particularly pointed out in the claims. I

Referring to the accompanying drawings forming a part of thisspecification in which like numerals designate like parts in all theviews: Figure 1 isa side elevational view of a machine built inaccordance with my invention showing the same in position to operate ona plurality of gin saws; Fig. 2 is a view similar to Fig. 1, but lookingin an opposite direction; Fig. 3 is a plan view of the machine ready foroperating upon the gin saws; Fig. 4 is a sectional view of the machineand gin saws taken on the line 4-4 of Fig. 1'; Fig. 5 is a sectionalview of the machine taken on the line 55 of Fig. 2; Fig. 6 is anenlarged elevational view of the circular file and pawl for operating onand between the gin saw teeth; Fig. 7 is an end elevational view partlyin section of the parts shown in Fig. 6; Fig. Sis an enlarged detailview illustrating the shape of the teeth of gin saws after having beenoperated upon by my machine; and, Figs. 9. and are detail sectionalviews showing means for holding triangular or square files, as may bedesired.

Referring to the drawings: 1 indicates any suitable support preferablyprovided with a pivotal connection to the frame. as shown in Figs. 1, 2and 5, and 2 is a power shaft which may be operated by any suitablemeans. Mounted on said shaft 2 is the driving gear 3, meshing with thepinion 4 mounted on Specification of Letters Patent. Application filedJanuary 11, 1913.

Patented June 15, 1915, 7 Serial No. 741,554.

the shaft 5, carrying the wheel 6, which is provided with the pin orconnection 7 to which is connected the pitman Spivoted as at 9 to thesleeve 10 mounted on the stud or pin 11. The pitman 8 may be in' twoparts, one of which parts 12, being adjustable upon the other part bymeans of the set screw 13 passing through a boss 14, all as will beclear from Figs. 1, 3 and 4.

. As best shown in Fig. 4, the pin or stud 11 is provided with anenlargement 15, through which passes the reciprocating rod 16 associatedwith bearings 17 and 18 carried by the bracket 19, pivotally supportedon the vertical pin 20 which in turn is sup ported by a bracket 21,mounted on the main frame 22 of the machine (see Fig. 1). One end of thereciprocating rod 16 is provided with a clamping member 25 and a setscrew 26 (Figs. 9 and 10), for the purpose of holding a triangular file27 or a rectangular file 28, as may be desired.

It is evident from the mechanism so far disclosed, that upon applyingpower to the shaft 2, the gear 3 will be rotated, which will turn thepinion 4 on shaft 5 and the wheel 6. The rotation of the Wheel 6 willreciprocate the pitman 8 and the pin 11, which in turn will reciprocatethe rod 16 in the bearings 17 and 18, as well as the file 27. Alsocarried by the shaft 5 is a wheel 30, equipped with a pitman 81 andother connections numbered 42, 32, 41, 33, 34 and 350, which areprecisely alike, or duplicates of, the corresponding members 7, 12, 9,11, 16 and 18 just described. In other words, the rod 34- reciprocates acompanion file 35 which crosses the file 27, as clearly illustrated inFigs. 1, 3 and 4, and which acts upon the teeth 80 ofthe gin saws 81 aswill appear below. It will, therefore, likewise be clear that theturning of the shaft 5 will reciprocate both the files 27 nd 35 tooperate upon the said teeth.

The bearings, such as 350, for the file carrying rod 34, are likewisesupported by a bracket 36, which is a duplicate of the bracket 19, andwhich bracket is also pivotally supported by a short vertical stud 38,which in turn finds its support in a bracket 89 mounted upon the mainframe 22. The bracket 89 is likewise a duplicate or a part of thebracket 21 which supports the short stud 20. A spring connects thebrackets 19 and 36, as shown, and therefore, constantly tends to pullapart the files 27 and or, in other words, to press said files 7 againstthe sides of the saw teeth 80. Further, as clearly shown in Fig.4, if wedraw a line through the members 7 and 9, and through the correspondingmembers 452 and 41, the said lines, when prolonged, will be found to beinclined to each other, and the same will be true if we draw linesthrough the axes of the pins 11 and 33, which are respectively at rightangles to the file rods 16 and 34. e

Itfollows from this construction that as the pi'tman 8 forces the rod 16to the right, as seen inFig. 1, it will tend to turn said rod 16 on itspivot 20 in a direction opposite to that of the hands of a clock, asseen in said figure, and when the said pitman 8 oscillate on the pins 20and 38 as centers.

During this oscillation, the spring 10 is placed under a greater orlesstension, and thereby holds the files yieldingly to their work. Alsorising from the main frame22 of the machine is a central support orbracket to which, as at 51, is pivoted a longitudinal baror member 52,carrying a beveled gear 53 mounted on the cross pin 54 on which is alsomounted the pinion 55, gearing with the main gear 3, as clearly illustrated in Figs. 1 and 3.

Meshing with the beveled gear53 is the beveled gear 56 mounted on thelongitudinally disposed sleeve 57 in which telescopes the rod 58surrounded by the spring 59. The outer end. of the rod-58 carries acircular file 60. Also mounted on the pivot 51 is i a forked cam lever61, the forks 62 of which straddle a cam 63 on the shaft 2, as bestillustrated in Figs. 2 and 3.

It will now be clear from what has just been said that as the shaft2 andcam 63 revolve, the lever 61 will be oscillated on its pivot 51, and assaid lever is connected by a spring 64: to an extension 65' of the frame52, the said frame together with the rod 58, the file 60, and the pinion55,as well as thebeveled gears 53 and 56, will all beoscillated on thepivot 51 as acenter. And, further, the turning of the gear'3 will,through thepinion 55, the bevel gears 53 and 56, and the rod 58, rotatethe file 60. In other words, the rotation of the cam 63 will move thefile 60 up and down into and out of contact with the gin saw teeth,while the gear 3 is rotat- 111g said file, all as will be clear fromFigs.

1 and 2. Also pivoted to the upright 50 as at 66, is the cam lever 67provided at one end with the roller 68 coacting with the cam 69 alsomounted upon the shaft 2. The other end of said lever 67 carries thepawl member 70 provided with the pawl tooth 71 adapted to engage theteeth 80 of the gin saws, as will be more fully'described hereinafter.But, it will be clear from. what has now been said, that as the shaft 2revolves, it also causes the lever 67 to reciprocate the pawl tooth 71up and down into and out of engagement with the teeth of the gin saws,and thereby rotate said saws one tooth at a time.

Attached to the member 52 is the angularly shaped piece 75 through whichthe rod 58 also reciprocates, and attached to the outer end of saidangular piece is the roller 76 adapted to take against the side of a saw81 as it rotates under the influence of the pawl 71 in order to steadythe saw.

The pawl member 70 is provided with a slotted extension 77 best shown inFig. 7, which straddles the shaft 58, and associated with saidextension77 is a slotted spring 78 which reciprocates up and down withsaid member 70. Associated with the spring 7 8 andmember 77 is thecollar 79 on the shaft 58. It results from this construction that as thepawl member is reciprocated by the cam lever .67, the spring 78 takesagainst the collar 79, which, when the pawl is' lifted, forces saidpawl. 71 forward so as toengage another tooth on the saw blade.

During the oscillation of the member 52 and the disk file 60, thepinio-n 55 rides up and down on the surface of the gear 3,.ow ing to thefact that both ends of the member 52 oscillate, but the gear teethare ofsuch dimensions that they are not, disengaged.

When, however, the endof the rod 58which carries the file 6;), movesdownward, the

side 100 of file 6O lies againsta collar on the shaft 58 and this saidcollar contacts with the member 77 carrying the'pawl tooth 71, whichsteadies said file during its gumming operation,and, as said pawlcontinues to rotate the saw, the file 60 acts upon the moving edge ofthe tooth to maintain its circular contour.

When the said file raised, the spring 59 forces the file forward j thefile 60 will be brought almost to its low-f est position by itseccentric 63. But, the said file 60 is brought to its position throughthe compression of the spring 64, and therefore the said file is capableof descending still farther when the said spring 64 is later releasedfromits compression through the further rotation of the eccentric 63.But, assuming the pawl 71 to be in its lowest position and the roller 68about to enter the said depression in the cam 69, as above stated, afurther turning of the gear 3 and the said cam 69 in a counter-clockwisedirection, as shown in Fig. 2, will cause the pawl 71 to suddenly rise,While the file 6O continues to lower under the action of the compressedspring 64. As the said cam 69 continues to rotate in a counterclockwisedirection, the roller 68 will ride out of the depression in said cam,and consequently the pawl 71 will begin to descend. The said pawl,however, in the meantime, has been tipped forward to engage anothertooth through the action of its controlling spring 110, as illustratedin Fig. 1, and therefore as it now begins to descend, it enters thethroat of the succeeding tooth, and after reaching the bottom thereof,it turns the saw in a clockwise direction as shown in Fig. 2. In themeantime, the compressed spring 64 continues to lower the file 60 and tocause the same to press firmly in the throat in its cutting out, and thespring 64 will remain under compression and keep up this pressure untilthe depression in the cam 69 has turned about 30 beyond the roller 68,and the maximum lift of the eccentric 63 has passed the eccentric yoke62. After the compression of the spring has been thus exhausted, thecontinued turn of the eccentric 63 will further lower the yoke 62, whichwill now cause the file 60 to rise out of the throat it has been actingupon, and it will continue to rise until the roller 68 is about or 90from the depression in the cam 69. After the file 60 has cleared thethroat, the spring 59 on the rod 58 forces the file forward over thesucceeding tooth, and the yoke 62 through the continued turning of theeccentric 63 will force the file down into the said succeeding throat ofthe next tooth. By the time the file 60 reaches the bottom of said nextthroat, the spring 64 begins to compress again, and continues to becompressed until the roller 68 again enters the depression 63, and thecycle is repeated indefinitely.

It will thus be seen that the teeth of the saw 81 are always under thecontrol either of the pawl 71 or of the file 60, which really acts as astop pawl when it is cutting between the throats. It therefore followsthat control of the teeth is never lost by this machine, and that thefeeding of the said teeth must be regular and certain under allconditions. So regular and certain is this feeding feature, even thoughbroken teeth are encountered, that the pawl 71 acts in the place wherethe throats formerly were, and

the said file 60 cuts in said places so that after the broken teeth arepast, the feed is taken up again with the new teeth and the same fedregularly and with certainty, as if no broken teeth had beenencountered. This important feature of my invention is greatly aided bythe further fact that the pawl 71 always acts in the direction of what Icall the pitch line of the teeth. That is to say, if the angle betweenthe front edge and the back edge of two adjacent teeth is bi-sected, andthe bi-secting plane prolonged through the saw, the path of said planewould be the direction of the pitch line of the teeth. The lever 67 ismade of such a length that the pivotal point of the member 70 carryingthe pawl 71 is located upon said pitch line for the pair of teeth thesaid pawl engages, and therefore it follows that the pull of the pawl 71is in the direction of this pitch line, and therefore it further followsthat even if a broken tooth be encountered, the rough edges left on thesaw will enable the pawl to turn the saw the proper space, precisely thesame as if the tooth had not been broken. Such being the fact, the file60 will likewise cut in the places where the throats oughtto be, andthus further aid the pawl in turning the saw. It further results fromthe foregoing that since control of the teeth of the saw is never lost,the feed and cutting is very regular and certain, and the machine may berun at a high speed. In addition to the above, since the pawl 71 movesthe saw throughout a large portion of the cycle, and since the spring 6causes the file 60 to continuously act in the throat between the teethwhen the cam 63 is not holding it there, there is practically no timelost in shifting the parts to accomplish the feed, and therefore, almosta continuous cutting is had throughout the cycle. iis feed increasesgreatly the capacity of the machine.

Another important feature of my invention resides in the fact that owingto the cushioning action of the spring 6% it affords a relief in casethe file 60 is nicked or broken or is otherwise irregular and tends tojam in the teeth. That is to say, should a broken portion of the file 60contact with the back or flat side of the tooth, then the said filebeing in continuous rotation, the resolved component of its motion whichwould tend to throw the file away from the saw, will serve to furthercompress the spring 64, and allow the said file to leave the saw withoutinflicting an injury thereon. Further, any force tending to move the rod58 in a longitudinal direction will also be absorbed by the spring 59,so that the said file 60 is cushioned in two directions at right anglesto each other, and may therefore automatically be thrown away from theteeth of the saw whenever a tendency to jam is encountered.

Still another important feature of my invention resides in the fact thatthe member 77 carrying the pawl 71 is cushioned by spring action, asshown, so that as the collar 79 comes forward, it pushes the pawl byacushioning action until the said pawl cont'actswith the back of asucceeding tooth whether the spacing between the teeth is regular orirregular. In other words, the feeding of the pawl forward isaccomplished with perfect regularity and certainty, although the teethmay be irregularly spaced apart. In addition to the above, the collar onthefiat face 100 of the file 6O affords a stop for the member 77 andprevents the pawl 71 from coming in contact with the cutting face of thefile 60, and therefore prevents the said pawl from being filed out ofshape, which would inevitably occur if some such means were notprovided- It will now be clear from the mechanism so far disclosed thatwhile the files 27 and 35 are cutting opposite sides'of the teeth 80,the file 60 is acting upon the throat of the teeth, and is alsofollowing the circular contour of the saw teeth in the manner justdescribed.

In order that the entire machine'may be readily brought in position toact upon-a gang of gin saws, the main frames 22 are provided with a pairof projections 82 and 83, as best seen in Figs. 1, .2 and 3, and eachprojection is provided with an extension 84: and 85, which extensionsmay project over the blades 81 of the saws, and their fiat sides 86 mayfurther steady said blades, as will be clear from Figs. 1., 2 and 3. Thesaid extensions 83 are adapted to rest upon the central hub 88supporting the saws 81, and the whole forms a steady and firm support bywhich themachine may accurately operate upon the saw teeth. r

In order that the files 27 and 35 may the more firmly rub against theindividual teeth 80, I have provided a forked lever 90 pivoted as at 91to the main frame, and having the springs 92, as best'shown in Fig. 4.The said springs 92 are preferably provided with lugs-or projections 93,which take against cams 94: and 95 carried by the main gear 3, as willbe clear from Figs. 1, 2 3 and 4. Accordingly, as the cams 94k and 95revolve, the projections 93 will be alternately struck by said cams, andthe lever 90 oscillated upon its pivct'91. Since said lever is connectedas at 96, to the spring 40, it will cause an additional and yieldingpressure between the file 27, or 35, as the case may be, and thecorresponding tooth 80 upon which it happens to be working.

The operation of my invention will be clear from the foregoing, but maybe briefly summarized as follows :Power being applied to the shaft 2,motion will be imparted through the gear 3, pinion 4, the-shaft 5, thewheels 6 and 30, to the pitmen 8 and 31, to the pins 11 and 33 to thereciprocating rods 16 and 34, and to the crossed files 27 and 35 actingon opposite sides of the individual saw teeth 80 of the saws 81.Simultaneously with this action, thecam 69 will oscillate the lever 67and will in turn reciprocate the pawl 71, whichwill turn the saw teeth80, while the saws are still acting upon opposite sides thereof, andthereby will cause the said teeth to assume the well known hawk-bill ortapered shape in two dimensions, which is so "desirable for gin saws. Inother words, it is evident that if the saws 35 and 27 actedupon theteeth 80,

while the said teeth are stationary, they could not be tapered in'twodirections at right angles to each other, as'is the case when the saidfiles begin at the base of said teeth andthe said teeth are drawnthrough V the files until they finish acting on the teeth at theirextreme points. This is an impor-' tant feature of my invention, and itis new with me, so far as I am aware. In addition to the above, the cam63, through-the lever 61 and connections, will oscillate the disk file.60 to gum the saw, or to cut out the throats between the teeth, andsince this cutting action only lasts for a brief'interval of time afterwhich the pawl 71 rotates said teeth while the file 60 is still actingthereupon, it is evident that the circular portion 105 (Fig. 8) of saidteeth will be acted upon by the said file 60, and the correct contour ofthe teeth therefore preserved. This is another important feature of myinvention, and is new with me, so far'as I am aware.

It results from the two" actions just de scribed, which are causedby'the movement of the teeth 80 past the files 2'7 and .35 and past thecircular file 60, that I am enabled not only 'to preserve the verydesirable hawk-bill shape to the'teethof gin saws, but I am even enabledby thismachine to give this shape to ginsaws whichhave been damaged byimproper filing. In other words, my machine sharpens and gums gin 1. Ina saw sharpening device, the combi nation of a pair of crossed filesadapted to.

cut opposite sides of teeth on the same saw; reciprocating holders forsaid files; a poWer shaft; pivoted supports for said holders;

connections between said holders and said power shafttfor reciprocatingsaid holders and files; a pawl for moving said teeth in a circular pathwhile said files are acting upon the same; and connections comprising alever and cam between said pawl and said power shaft adapted to causesaid pawl to suddenly engage a new tooth to exert a force in thedirection of the pitch line of said tooth, and to gradually feed saidfirst mentioned teeth past said files, substantially as described.

2. In a saw sharpening device, the combination of a pair of crossedfiles adapted to cut opposite sides of teeth on the same saw;reciprocating holders for said files; a power shaft; pivoted supportsfor said holders; connections between said holders and said power shaftfor reciprocating said holders and files; a pawl engaging a throatbetween two teeth for moving said first mentioned teeth in a circularpath while said files are acting upon the same; and connectionscomprising a lever and a cam between said pawl and said shaft, said pawlbeing pivoted to said lever and adapted to exert a pull on said saw in adirection of the pitch line between said second mentioned teeth,substantially as described.

3. In a saw sharpening device, the combination of a pair of crossedfiles adapted to act upon the opposite side of teeth on the same saw; acircular file adapted to act upon a throat between two teeth of the saidsaw while said crossed files are operating; and a pawl adapted to pullin the direction of the pitch line between two teeth to move the saidfirst mentioned teeth in a circular path while said crossed files andcircular file are operating thereon, substantially as described.

4:. In a saw sharpening device, the combination of a pair of crossedfiles adapted to act upon the opposite sides of teeth on the same saw; apower shaft; connections com: prising reciprocating members between saidshaft and said files; a circular file adapted to act upon a throatbetween two teeth of said saw while said crossed files are operating;connections comprising a shaft and gears between said circular file andsaid power shaft; and a pawl adapted to pull on said saw in thedirection of the pitch line between two teeth and provided withconnections to said power shaft adapted to move all of said teeth in acircular path while said crossed files and circular file are operatingthereon, substantiallv as described.

5. In a saw sharpening device, the combination of a pair ofreciprocating members carrying files adapted to act on opposite sides ofthe teeth of a saw; a spring for pressing said files against said teeth;a circular file adapted to out between a pair of teeth of the said sawsimultaneously with the operation of said first mentioned files; meansfor cushioning the action of said circular file in two directions atright angles to each other; a pawl adapted to turn said teeth in acircular path while all of said files are acting thereon; and means foractuating said files and pawl, substantially as described.

6. In a saw sharpening device, the combination of a pair ofreciprocating members carrying files adapted to act on opposite sides ofthe teeth of a saw; a spring for pressing said files against said teeth;a circular file adapted to out between a pair of teeth of the said sawsimultaneously with the operation of said first mentioned files; a pawladapted to turn said teeth in a circular path while all of said filesare acting thereon; and means for simultaneously actuating said filesand pawl comprising a cushioning device for said circular file, a powershaft, cams on said shaft, a gear on said shaft, a second shaft and apinion and wheels on said second shaft, substantially as described.

7. In a saw sharpening device, the combination of a pair ofreciprocating members carrying files adapted to act on opposite sides ofthe teeth of a saw; a spring for pressing said files against said teeth;oscillating means for increasing the efiect of said spring on saidfiles; a circular file adapted to out between a pairof teeth of said sawsimultaneously with the operation of said first mentioned files; acushioning means for said circular file; a pawl adapted to turn saidteeth in a circular path while all of said files are acting thereon; andmeans for actuating said files and pawl, substantially. as described.

8. In a saw sharpening device, the combination of a pair ofreciprocating members carrying files adapted to act on opposite sides ofthe teeth of a saw; a spring for pressing said files against said teeth;a lever connected to said spring; cam means for oscillating said leverto alternately increase the effect of said spring on said files; acircular file adapted to out between a pair of teeth simultaneously withthe operation of said first mentioned files; a pawl adapted to turn saidteeth in a circular path while all of said files are acting thereon; andmeans for actuating said files and pawl, substantially as described.

9. In a saw sharpening device, the combination of a pair of crossedfiles to act upon opposite sides of the teeth of a saw; a disk file tosimultaneously out between a pair of teeth of said saw; a cushioningmeans for said disk file; a pawl to turn said teeth while said files areoperating; means comprising a spring controlling the feed of said pawl;a common means for actuating said files and pawl; and a frame providedwith extensions for steadying and holding said parts to their work,substantially as described.

10. In a saw sharpening device, the combination of a pair-of crossedfiles to act upon opposite sides of the teeth of a saw;a disk file tosimultaneously cut between a pair of teeth of said saw; a cushioningmeans for said disk file; a pawl to turn said teeth while said files areoperating; means comprising a spring to control the feed of said pawl; acommon means for actuating said files and pawl; and a frame providedwith angular extensions passing over the teeth to be operated upon andresting against the sides of the saws for steadying and holding saidparts to their work; substantially as described. 1

11. In a saw sharpening device; the combi nation of means for filingopposite sides of the teeth of a saw; a circular file adapted to outbetween a pair of teeth of the same saw; a reciprocating shaft carryingsaid circular file; a slotted spring member through which said shaftpasses; a feed pawl carried by said slotted member; an eccentric foractuating said circular fil'e; a spring connection associated with saideccentric adapted to nation of a pair of crossed files adapted to' actupon the opposite sides of teeth on the same saw; a circular fileadapted to act upon a throat between two teeth of the said saw whilesaid crossed files are operating; a pawl adapted to pull in thedirection of the pitch line between two teeth to move the said firstmentioned teeth in a circular path while said crossed files and circularfileare operating thereon; and a support pivotally attached to the frameof the machine, substantially as described. i

In testimony whereof, I afiix my signature, in presence of twowitnesses.

JOHN E. SMITH, Witnesses:

PAUL- TURNER, J A. FoUcHE.

Copies of this patient may be obtained for five cents each, byaddressing the Commissioner of Patents,

. Washington, D. 0.

